'Fulfill' in the Bible

But Jesus answering said to him, “Permit it at this time; for in this way it is fitting for us to fulfill all righteousness.” Then he *permitted Him.

This was to fulfill what was spoken through Isaiah the prophet:

“Do not think that I came to abolish the Law or the Prophets; I did not come to abolish but to fulfill.

“Again, you have heard that the ancients were told, ‘You shall not make false vows, but shall fulfill your vows to the Lord.’